You may also want to sponsor discussion groups on certain topics. Whatever you do, do it strategically and make sure it relates to your mission. Determine if you can make a commitment to acquiring the needed skills, and to contributing and maintaining accurate information on-line. Incorrect information can be worse than no information. Make sure you post to the correct forum.
Local networks are best.
When in doubt, contact the forum's administrator and ask permission. Also, be sure to track the responses that result from your posts. Remember that many people will print out your information if its more than a few paragraphs, so always have contact information about your organization at the end of all your posts. Those are the three questions you ask first if you want to contemplate adding a virtual componant to your service delivery. You need to build on what you already do.