Laura works in ad sales at a well-known tech company.

Her office uses Slack, which is likely either as integral to your workday as email or you have never heard of it before.

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One day last summer, a saleswoman was looking for a conversation she’d had with an account manager, so she typed her own name in Slack’s search bar.

She found a public Slack channel, says Laura (not her real name).

Also, in addition to the standard display ads and in-app purchases, many companies are testing new marketing methods that meld advertising and content, such as's "promoted chats" (in which brands text with users).

Some track and collect user data -- including location -- for marketing purposes.

And, “people were getting called ‘dumb sluts’ left and right.” At first, as salespeople started reading, the talk continued, but then the account managers noticed who was joining and began to flee.

The fight-or-flight impulse was not particularly useful here: They could make the channel disappear from their own view of Slack, but running away did nothing to delete its history.Five-year-old messaging app Kik has a child pornography problem, according to experts.The app, which allows users to send text messages, videos and photos in one-on-one or group chats, has allegedly become one of the latest mediums used by sexual predators.Advertised as “Funny Anonymous School News For Confessions & Compliments” in the Apple Store, this anonymous app by Ambient is much like Yik Yak and Whisper. Learn more about After School in this Safe Smart Social video.ASKfm is a social network where members interact by inviting others to ask anonymous questions.Many messaging apps come with additional features that let users do way more than chat and share photos and videos: Kids can collect points to trade for stickers and emojis, stream additional news and content, play games, and even gain access to other chatting apps with different (not always age-appropriate) functionality.