Critics of former Alaska Gov. Sarah Palin have turned to Twitter to post hate "tweets" suggesting that "she should be shot" and "assassinated."

A four-minute video montage of the the "tweets" -- apparently sent after Saturday's massacre in Arizona that left six people dead and 14 wounded, including Rep. Gabrielle Giffords -- was posted to YouTube on Tuesday.

"My hatred for Sarah Palin continues to grow... I think this woman should be assassinated. Sorry about chya," was a message posted by "jenbobbi."

Another user, "misskate83," posted: "Sarah Palin should be shot for her encouragement of fanaticism against Democrats."

Calls to Twitter and YouTube were not returned on Thursday.

Twitter's terms of service read that all content "whether publicly posted or privately transmitted, is the sole responsibility of the person who originated such content.

"We may not monitor or control the content posted via the services and, we cannot take responsibility for such content," the social network says.

Attempts to reach some of the Twitter users who posted the messages were unsuccessful, but one claimed she is a "Reagan conservative" whose intent was taken out of context.

"Anybody who knows me, has read my blog, has read my Tweets, has breathed the same internet air I breathe knows I'm a Reagan-conservative-moving-swiftly-to-libertarian Mormon with a side of objectivism to spice things up," author Moriah Jovan posted on her blog. "Thus, it didn't occur to me that my tweet, made in conversation with someone else, in response to my utter disgust with the immediate blaming of Sarah Palin for Saturday's shooting of a Congresswoman would be taken as a literal threat against Palin and/or a wish for her death."

Jovan's blog continues, "It smacked me in the head last night when I was tweeted that I was 'scum' who had threatened her, with a link to a YouTube slideshow of a collection of tweets that actually DID wish her dead."

The video montage, set to the tune of The Beatles' "Imagine," had nearly 400 views of as Thursday afternoon.

Another user, embryodb, posted: "am I wrong to say sarah palin should be shot, fully realizing it would just crystallize radical right wing retards into more violence?"

FBI spokesman Paul Bresson declined to comment. A call to a Palin spokesman also was not immediately returned.

Hemanshu Nigam, founder of SSP Blue, an online safety and security consulting company, said most social network companies like Twitter ban hate speech or threats and have "solid mechanisms" in place to report such messages to law enforcement authorities.

"The messages that I saw ranged in the level of hatred as well as a level of threats," Nigam told FoxNews.com. "There are some that are alarmingly harsh and I think it would be a good idea if Twitter could review them and take action where appropriate. Every case is different, but Twitter does have the right to take action."

(Warning: this video contains graphic language) Click here to view the YouTube video.