follow list/bids

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My users are asking an option to follow the lists auctions, bids, etc. I know if a user make a bid, a pm is sent to him when someone make another bid. But my users are asking a option to have a button/link to "follow" the bids, so they can decide when to bid and be aware the action.

Is this possible?

[SMFHacks]

Would it send them an email whenever someone places a bid?

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Would it send them an email whenever someone places a bid?

A pm its better, since a pm are automatic mailed to users.