Swarm‘s latest update to the Android and iOS app today brings a new(ish) feature: Swarm Perks. Now, when you check into certain stores or national chains, you may be eligible for discount codes to present to the cashier for instant savings. For example, checking into places like Home Depot or Target may earn you 15 percent off a particular product type for a limited time. There’s also Swarm Challenges, which some users may have seen for a few weeks now. The weekly giveaway challenges users to check in to different types of locations to be qualified to enter a sweepstakes. Prizes include an all-inclusive trip,…

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