This is the A2SM Link Post for April 7th. To see more of the bookmarks we’ve found, check out our Delicious Feed

• Google Continues To Embrace QR Codes, Integrates Them Into Its URL Shortener – Last December, Google joined the myriad other companies that offer link shortening services with the launch of Goo.gl, the official Google URL Shortener. Today, it’s gotten a nifty new feature: add “.qr” to the end of any shortened link, and Google will generate a QR code for it. For example, the link http://goo.gl/SJhz would become http://goo.gl/SJhz.qr. The new trick was tweeted about earlier today by Google’s chief spam fighter Matt Cutts.
• Zynga Mafia Wars Addicts Can Now Whack Their Rivals With An SMS Message – Mafia Wars addicts can now get their fix anywhere they get a cellular signal. Social gaming giant Zynga has just started rolling out two-way SMS support for the popular mob-themed Facebook game, allowing users to both receive notifications and play the game from nearly any cell phone. The new feature is being rolled on a limited basis for now, but interested users can sign up for it here by clicking the game’s help button and selecting ‘SMS mobile’ from the menu.
• Plaxo Doubles Address Book Traffic, Raises Ambitions – Plaxo wants to be the Google of digital address books but the newly minted CEO, Justin Miller, knows it will be a difficult and long slog.
• UnitedParents To Provide Early Warning Against Online Predators, Cyberbullies – Stealth Israeli startup UnitedParents is stepping closer to the bright lights today by announcing a $900K seed round, and the beta availability of its online child safety product, aimed at alerting parents whenever their children become involved in a potentially dangerous relationship with online predators and / or cyber-bullying.
• Greylock Bats off Market Concerns, Calls Pandora an IPO Candidate [Video] – Last week we invited Greylock’s David Sze and Reid Hoffman into the studio for a chat about the state of the venture market, with its odd mix of soaring valuations and horrible returns. As it turned out, these two might be the worst guys in Silicon Valley to ask. I don’t say that because they refuse to pay up to be in good companies. (See Sze’s 2006 investment in Facebook—considered shocking at the time due to the company’s $500 million valuation, now considered one of the top trades in Web 2.0 history.) I say that because their portfolio doesn’t seem to be hurting.