Episode 12 of "Felicity"
s01e12 Friends

Felicity spies Blair kissing another girl in the library. Felicity plans to tell Elena, but keeps quiet when the girl turns out to be Elena's best friend, Tara. Blair tries to convince Felicity that he wasn't even at the library. He and Tara later confess to Elena, but claim that it was an accident. She is still mad, but elects to forgive them. Felicity talks with a guy with a photographic memory who frequents the library stacks. He has seen Blair and Tara make out on several occasions. Elena refuses to believe that Tara would betray her, and essentially orders Felicity to stay out of her business. She soon has a change of heart and backs out of a date with Blair, but tells him to go to the concert alone. She apologizes to Felicity, and they wait for the concert to let out. They discover that Blair gave Elena's ticket to Tara, whom he kisses outside the arena. Julie learns the identity of her birth mother, Carol Anderson. Ben comes along for moral support as Julie prepares to meet the woman. However, she cannot bring herself to go to the door. Julie becomes annoyed at Ben's well-meaning advice. Julie decides to make a tape for Carol and tell her all about herself. She catches a glimpse of her mother when she goes to her office to drop off the tape. Julie winds up picking up an application for an internship at Carol's architechtural firm. When students complain about the dorm's shoddy vending machines, Censa (the girl with the possibly connected family) offers to get Noel a good deal. He must pose as her boyfriend to win the trust of her overprotective relatives.