Well,
The EXIF data and the circumstances of the first one makes the first accusation suspect.
The second one , there is the claim (I am not a photo person, so I don't know) that there is evidence that the fingers of Franken's hands were photo shopped away from her shoulder.
The next two are anonymous. .. and have only been reported through Huffpo. Considering the efforts of Project Veritas to discredit the Washington post, until better details are forthcoming, they can be discounted as insufficient evidence for the details.
When there is positive evidence the first two claims lied, and the next two claims to a single source that is not the best for sniffing out inconsistencies, and the names are being withheld, well, I need more.
While I agree with a lot of Huffington posts politics, they are not too professional with fact checking sometimes. I can see them being taken in by something like Project Veritas, which lied for political reasons.