Like or unlike a tip

https://api.foursquare.com/v2/tips/TIP_ID/like
Allows the acting user to like or unlike a tip.
HTTP MethodPOST
Requires Acting UserYes (learn more)
Modes supportedfoursquare (learn more)
Parameters
All parameters are optional, unless otherwise indicated.
TIP_IDXXX123YYYYrequired The tip to like or unlike.
set1If 1, like this tip. If 0 unlike (un-do a previous like) it. Default value is 1.
Response fields
likesUpdated count and groups of users who like this tip. Groups generally include friends and others (indicating the relationship to the acting user), but are subject to change.