t.coは安全ですか？

To quote the website itself: Twitter uses the t.co domain as part of a service to protect users from harmful activity, to provide value for the developer ecosystem, and as a quality signal for surfacing relevant, interesting Tweets. This website does not contain anything on it itself, it is simply a redirector to other sites that are linked in Tweets. Therefore, it is hard to tell whether t.co is safe or not.

ORDURE aux Sites totalement ILLÉGAUX, aux mentions légales erronées, en WHOIS caché comme d'habitude chez les ESCROCS qui balancent des POURRIELS à répétition pour du PHISHING puis du SCAM ! A FUIR immédiatement de telles raclures de bidet... GARBAGE in the TOTALLY ILLEGAL Sites, without any legal notice, in WHOIS hidden as usual at the SWINDLERS which rocks repeated SPAMS for the PHISHING then the SCAM ! To RUN AWAY FROM immediately such scrapings of bidet ... SCHMUTZ in den völlig UNGESETZLICHEN Websiten, ohne eine gesetzliche Erwähnung, im versteckten WHOIS wie gewöhnlich bei den BETRÜGERN, die POURRIELS in Wiederholung für den PHISHING dann SCAM schaukelt ! Sofort solche Späne von Bidet zu VERMEIDEN... МУСОР в полностью НЕЗАКОННЫХ участках, без любого юридического уведомления, в WHOIS, скрытом как обычно в ЖУЛИКАХ, который трясет повторный SPAMS для PHISHING затем ЖУЛЬНИЧЕСТВО ! ИЗБЕГАТЬ немедленно таких очисток биде.... 垃圾中的完全非法的站点，而不受任何法律通告，在 WHOIS 中隐藏的象往常, 的岩石 重复 SPAMS 的网络钓鱼然后骗局 ！ 为避免（逃亡）立即这样的 scrapings 的坐浴盆...

Twitter has so many scam artists that link their sites through their services and when attempting to report this abuse to twitter, there is no simple way to do so; one link leads to another and so on and on. Twitter encourages and enables abuse through this sneaky misdirection, thus I do not recommend twitter as being trustworthy whatsoever.

URL shortener used in twitter.From twitter: Why does Twitter have its own link shortener?    Shortened links allow you to share long URLs in a Tweet while maintaining the maximum number of characters for your message.    Our link service measures information such as how many times a link has been clicked, which is an important quality signal in determining how relevant and interesting each Tweet is when compared to similar Tweets.    Having a link shortener protects users from malicious sites that engage in spreading malware, phishing attacks, and other harmful activity. A link converted by Twitter’s link service is checked against a list of potentially dangerous sites. Users are warned with the error message below when clicking on potentially harmful URLs.