// remove person modelview from cache as groupstreamhiddenlineindex will be changed.
deleteCacheKeyMapper.execute(Collections.singleton(CacheKeys.PERSON_BY_ID + followerId));
// Sends new follower notifications.
asyncRequests.add(new UserActionRequest(CreateNotificationsRequest.ACTION_NAME, null,
new TargetEntityNotificationsRequest(RequestType.FOLLOW_GROUP, followerId, targetId)));
// Posts a message to the user's personal stream unless this is a new pending group
if (!isPending)
{
String targetStream = "";