Church Websites

Over the past three weeks I have been meeting on Thursday evenings with a group of people who are prayerfully considering planting a satellite congregation in the Ft. Belvoir/Lorton, VA area. I am working on a team that is looking at the communication needs of a new congregation: web presence, email, social-media, marketing, branding, etc. Personally I have been examining the practices of congregations who are utilizing social media to introduce themselves to the community and communicate effectively with their members. In addition, I am researching website options for a multi-site congregation. So now I have questions:

How does your church utilize social media in communicating with members and the community?

What are the best practices of churches who utilize their websites to introduce their congregations to the community?

In a multi-site congregation, does each campus have a separate site or are they combined with shared information?