What are some alternatives?
When comparing Lobsters and Tipestry, you can also consider the following products
Hacker News - Hacker News is a social news website focusing on computer science and entrepreneurship. It is run by Paul Graham's investment fund and startup incubator, Y Combinator.
Hypothes.is - Annotate with anyone, anywhere
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
Dissenter - Dissenter is the comment section of the internet. It creates a digital public square on every URL.
Raddle - A web-based forum where users submit links, pictures, posts, etc.
Slashdot - News for nerds, stuff that matters. Slashdot (aka /.