That's a very nice question. Sometimes it feels like everyone wants to show their new projects, and post them into shouts, one after another. I do so too, for some arrangements, cause i'm asking for bass, vocals, influence. Works, if you don't overload it with links, needs the right timing. But i am really happy that peeps keep on shouting, else i'd have missed a lot of great sessions.
I also post sessions of others, not only mine, there are tons of jams we haven't heard yet, that's why it is important to keep it that way. I don't like shouts like ' #***** my new jam :D ' or somethin, there's a bit details needed for me. It's up to you anyway, check it out or leave it, it won't be useless tho. Wikiloops aye
For very important sessions i use PM's. No need to add anything, if there's no feelings and ambitions. But shoutbox is an option, a little chance to grab the right person with it's special vibe. Something like that