The father of the 15-year-old girl filed a police complaint last night at the Sector 49 Police Station, SHO Vinay Prakash Singh said.
The man, a resident of Sector 49, alleged that someone made the fake account in his daughter's name and posted an obscene video on it, the SHO said.
An FIR was registered and the case forwarded to the cyber cell for investigation, he said.