Note on hashtag support, which is related to Group support:
As I see Twitter API, you can get messages with a hashtag by simply searching for the hashtag, see https://dev.twitter.com/rest/public/search (GNU Social borrowed most of Twitter REST API some time ago...)
AndStatus has Global Search feature, so you can search for tagged messages there.

http://www.skilledtests.com/wiki/Twitter-compatible_API#Group_resources should be sufficient thanks to @erkan (there's a copy on web.archive.org #WaybackMachine too)
Should be the same thing as with profile subscriptions, provide the local ID and it should work. Won't currently work with remote group nicknames, aliases or (unfortunately) URIs.

mmn@social.umeahackerspace.se
URL: https://loadaverage.org/notice/6780474

Another note from our conversation:
@mcscx Did I understand you correctly about groups in GNU Social, please correct me where I'm wrong:

1. Any user can read group's Timeline, e.g. here: https://status.vinilox.eu/group/gnusocial
2. If some User tries to post to a Group like this: !gnusocial the post will appear in the Group's Timeline only if the User is a "Member" of this group.
3. In order to receive group's messages as part of User's Home (?) Timeline, the User has to "Subscribe" to the Group.
4. To be a "Member" and to "Subscribe" is the same thing. So "Members" and "Subscribers” are synonyms.
   URL: https://loadaverage.org/notice/7859595

It appears that for GNU Social we already can post to a Group using !syntax and read messages of this group in a Home Timeline.
@vinzv What "Group support" feature should be added next?

@vinzv Do I understand correctly that you already can view messages of subscribed groups in AndStatus's Home Timeline? But you also want to see messages of any selected group as a separate Timeline, just how we can see "Messages by SelectedUser"
?!

@yurivolk A query of a selected group would be awesome. I'd guess also quite important for a lot of users. Mustard e.g. does this by 'search' and lets you bookmark it, so you can switch quickly to the complete group timeline.

Am 6. April 2016 07:25:57 MESZ, schrieb Yuri Volkov notifications@github.com:

@vinzv Do I understand correctly that you already can view messages
of subscribed groups in AndStatus's Home Timeline? But you also want to
see messages of any selected group as a separate Timeline, just how we
can see "Messages by SelectedUser"
?!

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#248 (comment)

Be seeing you!
andre.

@yvolk Yes, exactly.

@morphtown Yes, I often think about creating a shortcut for my favorite search...

[Edited 2016-10-23] Added Lists of Pump.io to the comparison.

Upon reading about:
L. Lists in Twitter https://support.twitter.com/articles/76460?lang=en and comparing this with
G Groups in GNU Social (see comment above) and
LP. Lists of users in Pump.io (there are other "lists" in Pump.io also... see https://github.com/pump-io/pump.io/blob/master/API.md )
I see these main differences between these things:

1. Content (messages timeline):
   G. Messages in a Group are about some topic. Members of a group post only some messages to this group. Text of the message contains "!groupname". This is close to using hashtags...
   L. Messages in a List are all messages by some users - members of the List. So these are messages by Users.
   LP. There is no such thing in Pump.io API as the "List's Timeline"
2. Management.
   G. User generally is not able to change Group membership (other than his/her own)
   L. User can create his/her lists and include any other user there.
   LP. Just like for "L."
3. Posting
   G. Explicitly type !groupname in the text of a message.
   L. Nothing to do. If you are a member of a list, all your posts will be in that list.
   LP. Set a list as a message's recipient to post the message to all members of this list.
4. Reading
   G. User either subscribes to a List/Group and then can see it in the Home timeline OR he can see the Group timeline directly, requesting it from a server.
   L. Looks like only direct request of the List's timeline ?!
   LP. "Activities that are to a user or list will go into their "direct" inbox". This means that there is no way (in API) to read only one list's timeline.
5. Discovery
   G. List of groups belongs to a GNU Social instance
   L. Lists (in Twitter) belong to Users, so they are discovered via users...
   LP. Similar to "L." E.g. https://identi.ca/api/user/andstatus/lists/person contains lists, created by "andstatus@identi.ca" User.
   ...

Each "Type of Social network" has only one thing: "Groups" or "Lists", so we could implement them in AndStatus as one "Lists" thing, maybe providing alternative name for GNU Social...

Custom syncable Search timelines implemented in v.27.00
So now in order to have a separate timeline for a GNU Social group, you can create e.g. a Search ”!gnusocial" timeline and make it syncable.