Social networking site

Details:
i need a developer to create a U.S. business social networking site
the site must allow users to create an account with thier linked in account
or an original account.
it must be spam proof (captcha)
no video, groups or audio of photos (only profile photos)
the basic fee profile will allow members to
create a profile with full name,education, work bio, industry, occupation, professional accomplishments, and city, and state
an extended (paid ) profile will allow the individual to tag his profile with social interests (e.g reading, art classes, attending live sports events, wine tasting, sports leagues etc.)

members with a paid account can create the full extended account, and invite other members to social events, no more than 7 members, i will be able to charge for these events.
free accounts can search and see it all but can not join or attend an event unless he or she upgrades.

i want to be able to create community wide social events where members can attend events with other professionals that have similar interests. from 5 to 20 events.
members should be able to get emails when the events are created and search for it on the site as well go to the location city of the event, and see a list of the events and click to get more information
i will be able to charge for this events