Here are my ideas:
InLet -Inbox for Letters, but also a calm sea port where ships dock
Hubbub - A social hub of chatter!
MemoKen - (Memo + ken which is a word which means “know”… to be “in the know”)
GrInbox - the inbox that makes you smile
ThreadHaven - A resting place for all the threads of your social world
Hubken - The Hub of Knowing