Social2Search is ad-supported browser add-on. It is promoted as "social search engine", that will show you results that your friends share. As a result, Social2Search inserts module inside Google search engine, that looks like part of Google ad system, but in fact those are ads by Social2Search. Social2Search targets Google Chrome, Mozilla Firefox and Internet Explorer browsers, which are 3 most popular browsers.
CTB-Locker is very wide-spread and dangerous ransomware virus. It uses RSA-2048 encryption to encrypt various types of files stored on users computers (documents, images, photos, music, videos). Then CTB-Locker demands the ransom of $120 - $300 and shows message on your desktop: "Your personal files are encrypted by CTB-Locker". Ransomware also creates text file with instructions DecryptAllFiles.txt in every affected folder. The virus itself is rather simple to remove, however we recommend you to use removal tool.
Yessearches.com is website built as search engine with ad banners, that redirects user searches to Google or Yahoo websites. It can be installed as default search engine and homepage by various browser hijackers. Your browser shortcuts may be also modified to redirect searches to sponsored search results. This website overcomes browser settings and may become a threat to your privacy, by getting access to browser history, cookies and other private data.
Piesearch.com is intrusive search engine that installs in Google Chrome, Mozilla Firefox, Safari and Internet Explorer without users consent. Hijacker overrides any default settings and may infect browser shortcuts. As a result Piesearch.com will open on a new tab every time you start your browser. Piesearch.com can redirect your searches to Google or Yahoo, but it is not recommended to use it as it contains links to untrusted and dangerous sites.
Yoursearching.com is another browser hijacker. It installs in Google Chrome, Mozilla Firefox, Safari and Internet Explorer. In some cases it also infects Opera browser. Yoursearching.com also hijacks browser shortcuts in Start Menu and on the desktop. Yoursearching.com redirects user searches to Google or Yahoo, but may insert additional advertising and use your browsing habits for advertising properties.