The web interface can be Flash but socket communication must be cross platform (not just PC). The dating site username becomes the chat nickname, and unique keys fetch profile data and thumbnail pic from the dating site database.
Check out [url removed, login to view] (user: sohojoe / pass: pass) - choose a chatroom on the left). This similar web interface for IRC has hover-over user profile summaries and thumbnail pics, which are also required.
A suggested web interface look and feel for this project is along the lines of: [url removed, login to view]
(click ENTER ROOM - then the ad banner to see private chat).
If you have excellent IRC and web integration skills please show relevant work and provide a cost estimate for the job.