A friend of mine landed his last six clients as a direct result of his participation in LinkedIn Groups. Another sees his groups as a natural extension of his social-media marketing efforts.

And believe it or not (I still find it hard to believe), a third somehow managed to meet her fiancé in an HR-focused group.

LinkedIn groups are informal communities formed around industries, professions, themes, niche topics, etc. Because any LinkedIn member can create one, there are now well over a million groups.

Find and join the right groups, and it’s easy to keep up with news and trends, make connections, ask and answer questions, land new clients—even start a romance. (Well, maybe that last one isn’t so easy.)

Here’s how to find the right groups for you:

Read More: INC