Here are 8 ideas for you.

1. Remember that 99% of the time you are not going to make a direct sale through online networking. (Online networking is about opening doors so you can make a sale.)
2. Write some blog entries that are free basic information about something you are an expert in with no direct sales pitch.
3. Write blog entries about stuff that really gets you excited or that you wish would go away.
4. Create a photo-gallery in picassa, flickr, photobucket or where ever and include your hobbies; let folks know when you post new pictures through “status updates.”
5. If you take pictures and travel, consider geo-locating them in your album
6. When you find something of interest on the web—tweet about out it, link to it on your blog, put a posting in delicious or dig, mention it facebook or myspace.
7. Tweet about the “stupid” stuff in your life (not just the serious and not just the sales) (Same for status updates). I probably do not care that you are about to brush your teeth, but I might find it interesting that you just went on a 5 mile run.
8. Use the tools in linkedin, plaxo, myspace, facebook, friendfeed, etc. that let you see what is going on in other people’s lives. They often have pages where you can see the “updates” others have made.