- Social Network?
- User Ratings
The features that you wish your social networking site to have will likely be a driving force in your search for a quality solution. The creation of events in a calendar system, for example, may be imperative for some groups (like a local hobby group), while completely unnecessary for others (like an international interest group). A solution that gets rave reviews and meets most of your needs may fall off of your list of possibilities if it's missing a key component you need for your site to be successful.
The features list here paints a broad stroke. One forum, for example, does not equal another. Some sites offer the capability of receiving email updates when a forum post is made or updated while others do not. One site even allows you to receive and reply to forum posts via email. It's beyond the scope of this site to catalog every combination of feature-related options available in the different solutions. Not to mention, most solutions are continually being actively developed and it would be close to impossible to keep the information up to date. It's strongly encouraged that you utilize this list as a starting point to narrow possibilities down to those that have the core features you require. Combining that list with information from the reviews here and you should have a solid head start on fully investigating a handful of options to see which might work best for you. From there, be sure to investigate whether individual features of a site include the specific features you also require.