You don’t have to be present in your community 24/7 to be a good community manager. If time is short:
- Post a public comment on one member’s profile.
- Send a private message to one member, thanking them for being part of the community.
- Mention one member in a public post (forum/blog).
Easy, and not too time-consuming. Imagine the effect if you did this each and every day, along with your other duties as a community manager.