That’ll work when typing things online, but not in f2f conversations. I thought about ‘com(m)’ which will work, typed out in certain contexts, but I think that sounds too much like other words in several languages including English to use in speech. But if you prepend ‘lemmy’ to that it’s quite a distinguishable word that sounds like ‘lexicon’: lemmycom(m)!
There’s a lemmycom for that.
I’ve only been on mastodon for a couple of days, but yes it is active, and depending on what you’re after it might we worth it. For me, it seems to be a nice mix of keeping up to date with things and people I already know, and at the same time stumble upon (related) things I did not yet knew about.
You will have to put in some effort to follow people/accounts/hashtags, but that’s kinda fun. Just try it out!