Here are the top digital marketing data and case studies that caught our eye.

Facebook accounts for quarter of all web traffic (as YouTube drops)

Facebook now drives nearly 25% of the web’s traffic, with YouTube losing out the most, according to new research.

Snapchat ads costs $750,000: Are they worth it?

Running an ad on Snapchat, the self-destructing messaging service that’s hugely popular with teens, costs a massive $750,000 a day, according to a new report.

How SnapChat’s prices compare
To put Snapchat’s pricing into perspective, here’s some typical ad costs for major platforms and events:
• An advert during American Idol costs approximately $475,000 (£313,185)
• A 30-second slot during the Superbowl costs around £4 million (£2.6 million).
• YouTube charges $500,000 (£329,760) a day for a masthead.
• Instagram runs similar Sponsored Posts to Snapchat, with prices ranging from around $350,000 (£230,830) up to $1 million (£659,000) – but that is said to be for a month-long contract.
• Twitter is said to charge per click, known as engagement, at around $2 (£1.30), but Promoted Trends are quoted in the region of $200,000 (£131,880).
• Facebook advertising varies widely based on the audience, budget, how long the adverts will run and if the firm wants to pay per click – but prices start as low as $1 (66p).

Google admits ‘more than half its ads are never seen’

Most display ads are not seen by anyone on the web, apart from bots, according to new research from Google.

The battle for consumer data: Facebook beating Google for social logins

Facebook is leading the race to own customer identity, accounting for more than 60% of all social logins, as the social network and Google look to boost their consumer data.

Facebook user trends: 75% of audience from mobile by 2018

Almost 1 billion Facebook users worldwide will access the platform on a mobile phone at least once a month this year, with more than three quarters of Facebookers set to be mobile users by 2018, according to a new report.

Mobile app trends for 2015: The year apps go programmatic?

App monetisation and programmatic availability as the most prevalent goals for app developers and publishers, according to a new report.

CASE STUDIES

Mobile search case study: How George at Asda’s mobile conversions outperformed desktop

With an improved mobile site in place, the team at George at Asda wanted to drive smartphone traffic and conversions through intelligent use of Google AdWords. This case study looks at how the clothing brand used smart keyword bidding to ensure that mobile outperformed desktop for search conversions for the first time in the account’s history.

Instagram case study: Nike lets customers design their own trainers with Instagram photos

Drawing on the success of its custom shoes site NIKEiD, Nike teamed with Instagram to create NIKEPHOTOiD. Instagram is emerging as a key social platform for driving audience behaviours and with this knowledge Nike launched one of the most successful campaigns on the social network to date.

Social media case study: How Sweaty Betty built its brand around its fans

Sports and fitness are often very social activities, and UK sports brand for women Sweaty Betty capitalised on this to offer a drastically different shopping experience for consumers compared to the ‘warehouse’ feel from the likes of Sports Direct. So what makes Sweaty Betty stand out in the overcrowded fitness market? This case study looks at how the brand built a social community around fitness challenges to boost brand loyalty.

@ClareeSherry glad you enjoyed the workout from the @sleektechnique girls. Don't forget to try the new #SBFlyFlexFlow workout too…

— Sweaty Betty (@sweatybetty) January 25, 2015