WASHINGTON POST - Jan 18 - Bumble, Tinder and others are freezing out rioters with help from law enforcement and, in some cases, their own photos. Other app users have taken matters into their own hands by striking up conversations with potential rioters and relaying their information to the FBI. Some onlookers have celebrated the viral hunt as a creative form of digital comeuppance. But some privacy advocates said the episode reveals a worrying truth about pervasive public surveillance and the opaque connections between private companies and law enforcement. Both Bumble and Match Group said they were working to remove users known to be involved in the Capitol siege from their platforms.