You might want to check out Little Snitch at the following link: I've been using it for a number of years and have been pleased with the results. The following info is taken from their website: As soon as you?re connected to the Internet, applications can potentially send whatever information they want to wherever they want. Sometimes they do this for good reason, on your explicit request. But often they don?t. Little Snitch allows you to intercept these unwanted connection attempts, and lets you decide how to proceed. Little Snitch informs you whenever a program attempts to establish an outgoing Internet connection.
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You can then choose to allow or deny this connection, or define a rule how to handle similar, future connection attempts. This reliably prevents private data from being sent out without your knowledge. Little Snitch runs inconspicuously in the background and it can also detect network related activity of viruses, trojans and other malware. MacScan 2 is free for 30 days but then you have to buy it or stop using it.It scans your Mac for a number of things including tracking cookies.I would recommend 'MacScan 2' and 'ClamXav' if you are worried.I use them both and have found about half a dozen nasties over time. Here's a short piece of the description of MacScan 2 that comes with the app: In short MacScan's goal is to detect, isolate and remove spyware from your system such as keystroke loggers and trojan horses.
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Keystroke loggers are programs that are used to record everything that is typed on the keyboard, and log them to a file. Some keystroke loggers will send the logs over the Internet to a specified address programmed into the application. The loggers are not limited to what text they record, if you're typing a letter, or typing your credit card or social security number it is all logged.
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Hope that helps.