If you installed Madden NFL Social when it released on Nov. 1 and haven't played it much since, it might be a good time to check back in. The game's latest title update dropped 100,000 of the game's virtual "coins" on anyone who had a copy of the game installed before this week.
The 100,000 coins is enough to buy one three-star pack of player cards, which deliver one rare player and four current NFL players. "Madden Social Cash" is the only currency that can buy four- or five-star player packs, additional plays, or "energy," which governs the number of offensive drives you may play in a certain span, so, basically, they're giving you a free three-star pack of cards, or two two-star ones and some change. My impressions of Madden NFL Social explain its economic structure in greater detail.