I've commented on Lantern before, such as when Facebook commissioned a phoney "human rights assessment" to essentially justify what they wanted to do.
It is opaque. There are terms which appear alarmingly over-broad. It involves companies who have not been competent in handling such things. It appears to be intrusive.
I'm a fairly no nonsense person here, so Facebook operating a platform to sift through other people's data tends to ring alarm bells in my head, *especially* when considering their history when it comes to privacy.